It's that time again! Tonight—from 8:00 to 9:30 PM, live on FOX—this season's American Idol Top 4 will each perform two songs for the judges' critiques and our votes. Want in on the action? Your open thread is inside.

Here's the gist of what to expect tonight: Four finalists, each singing two songs from songwriting duo Jerry Leiber and Mike Stoller. Lady Gaga will be there as a mentor! The episode lasts 90 minutes and will air live on FOX. Ryan Seacrest hosts, and the judging panel consists of Steven Tyler, Jennifer Lopez and Randy Jackson.

While you're waiting for the show to begin, feel free to chat in the comments below.

If you haven't participated in one of our live-blogs before, don't fret—it's easy! All you need to do is tune your TV to FOX, watch the show, and discuss all the action with everyone else in the comments. It's really as simple as that. If you don't have a commenter account, just sign up for one (it literally takes seconds) and we'll get you approved right away.